Questions tagged [arduino-uno]

The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328P microcontroller.

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263 views

Arduino Uno cannot upload any sketch: avrdude: stk500_recv(): programmer is not responding

I'm newbie in Arduino Dev I got Arduino Uno R3, at first it just worked fine. I tried to upload my whole project sketch which almost up to the max size of arduino memory. Then suddenly the upload ...
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1answer
223 views

What happens if you supply too much voltage to an LED? [closed]

Say I have an LED that requires 3.5v. What happens if I power it with more voltage? For example, my Arduino Uno has a 5v pin. If I power the 3.5v LED from the 5v pin, what will happen?
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3k views

When the Arduino is in reset mode are the digital pins high impedance?

I have an Arduino (Arduino A) hooked up to an external FRAM chip and I want to be able to pull the Arduino A's reset pin to ground to keep it in a constant reset state. Then I want to hook up another ...
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2answers
552 views

Arduino box stops working: Reading RFID tag and sending data over network

This is a simple Arduino program which reads RFID tag and sends the data over a network (lora). The program works fine in as i run it, the arduino reads RFID and sends it over the network (lora) ...
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0answers
80 views

Post Data Server from Arduino using Fuzzy Logic

Can somebody help me , when i run this code separately , no problem was found , but when i fuse it together , only fuzzy work and the data can't be sent to my server, sorry for my bad english i ...
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2answers
3k views

Arduino not working / not uploading [duplicate]

Could anybody please help me with my problem? My Arduino doesn't work correctly. I was between a project, and suddenly it started acting weird. First, it started taking about 4 minutes to compile and ...
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1answer
207 views

problem in integrating the slave code in attiny 84

I tried the whole process by using two arduino unos.It worked perfectly. Though when i tried to replace the slave uno with attiny 84 uC it showed following errors in compiling. Arduino: 1.6.7 (...
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1answer
2k views

Write array to serial port

The Code Below now works: void SendCTRL (String &input) { const char *hin = input.c_str(); // Get character array int clen = input.length()/2; unsigned char cmd[clen+1]; // Leave a byte ...
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1answer
952 views

when i compile this code it always 'sendCommand' was not declare in this scope..plzz help

#include <SoftwareSerial.h> #define DEBUG true SoftwareSerial esp8266(10, 11); // RX, TX void setup() { // Open serial communications and wait for port to open: Serial.begin(9600); //for ...
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3answers
2k views

How I can print several numbers via Serial with very few lines of code?

Could someone help me how to output the numbers from 1 to 10 via Serial, without having to write out each command by hand? Below is my sketch - I need it concise instead of a long sketch: #include &...
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1answer
507 views

Arduino - Calculating the time for which a Pushbutton is pressed and held without being released

I'm working on a project that requires calculating the time for which a pushbutton is kept pressed without being released. Is there a code snippet that i can use for this particular need ?
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2answers
638 views

Creating an Arduino Tic Tac Toe game

I'm trying to create a Tic Tac Toe game using the Arduino Uno. Since the Uno has a limited amount of pins to use, I am trying to see if there is a configuration that would make the project possible. ...
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1answer
291 views

Conflict between SD card shield and accelerometer

I'm trying to get the SD card (Adafruit microshield SD card) and an MPU6050 accelerometer to work at the same time. When I connect the SD card to the Arduino (without the accelerometer), it's ok; When ...
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1answer
4k views

byte Array to CRC calculation [closed]

I'm trying to implement a CRC check on my Arduino and Thanks to you guys I think I've got this working: unsigned int CRC(byte input[], int array_size) { unsigned int crc16 = 0xFFFF; int pos = 0; int ...
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1answer
20k views

Error compiling code for Arduino/Genuino Uno

Arduino: 1.8.6 Hourly Build 2017/10/20 02:33 (Windows 10), Board: "Arduino/Genuino Uno" c:\users\hp\desktop\arduino-nightly\hardware\tools\avr\bin../lib/gcc/avr/4.9.2/../../../../avr/bin/ar.exe:...
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2answers
3k views

What is VREF pin?

Was searching for some help on connecting Flir camera w/ Lepton board to arduino and found this thread for power you can reroute the 3-5V to the VREF pin, then you have a nice clean solution. You ...
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1answer
837 views

Not in sync: resp=0x00 [duplicate]

I had problems with Arduino uno and reseted firmware. Followed this tutorial. Now I can't upload my code Arduino IDE says: avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync(...
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2answers
760 views

Arduino not in sync unique error

When I try uploading to my Arduino/Genuino UNO I get the following not in sync error with "unique" resp(resp=0X54) or (resp=0X81) please solve ... I have to submit my project tommorow...... error ...
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1answer
1k views

“avrdude: stk500_recv(): programmer is not responding” when uploading sketch

When I try to upload any sketch to my arduino uno r3, the code compiles, the board resets and the RX light blinks 3 or 4 times.I have nothing from the TX light. The uploading progress bar in the IDE ...
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1answer
35 views

How can I distinguish values sent from Arduino [closed]

Having in my visual basic app something like: private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e) { *whatever* value = serialPort1.Read*whatever*(); } ...
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1answer
2k views

Three phase sine wave inverter using Arduino

I want to design three phase sine wave inverter using Arduino I found this link with circuit diagram and simulation results but he did not provide code. can anyone help me with code http://...
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1answer
462 views

Arduino Uno coding problem voltage varying [duplicate]

I was wondering whether anyone could help me... I am using an Arduino Uno and I am writing my code in the Arduino IDE. I am trying to implement the code so that the output voltage can be varied from 0 ...
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2answers
75 views

Keyboardmessage on Arduino UNO

Can an Arduino UNO and Arduino Leonardo do the same things? Some of the examples in the Arduino software say to use Leonardo e.g. KeyboardMessage.
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1answer
541 views

transmit a sequence of bit using arduino uno [closed]

How do i code to transmit a sequence of bit using arduino uno?My project is about a transmitter and a receiver.Arduino as the transmitter and an application as the receiver.Light sensor will detect ...
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1answer
129 views

No matching function for call to 'TembooChoreo::TembooChoreo()'? TembooChoreo SendSMSChoreo; Error Help

Arduino: 1.8.8 (Windows 10), Board: "Arduino/Genuino Uno" C:\Users\user\Documents\Arduino\intruderAlarmTest\intruderAlarmTest.ino: In function 'void loop()': intruderAlarmTest:46:18: error: no ...
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2answers
10k views

avrdude: ser_open(): can't set com-state for “\\.\COM2”

I have an unofficial Arduino Uno. I've tested these: Testing on USB 2.0 and USB 3.0 Changing Port (COM XX) Updating drivers for the Unknown device to Arduino Uno (COM XX) Resetting ...
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2answers
19k views

how to use strstr() in serial communication?

I have a SIM900 module and Arduino, both are working fine. In my previous programs I have use strstr() command to find specific word from a string but they were constants and pre defined in the ...
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2answers
238 views

Arduino & ESP8266

I connect my ESP to Arduino to my PC. If I send AT commands from my serial monitor, I receive full response. I use 115200 and both NL & CR in my serial monitor. ESP TX is connected to TX Arduino,...
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2answers
286 views

running gba files in arudino [closed]

Can I run GBA files on an Arduino or make an emulator? I have a 2.4" tft touchscreen and a controller - is it possible to make? Can anyone give the code for running GBA files in Arduino?